Redwood

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Redwood Sequoia sempervirens

Description

A soft, red coastal tree, Sequoia sempervirens, found within 30 miles of the Pacific coast in northern California and southern Oregon. Redwoods are the tallest living trees and soome are more than 2000 years old. The redwood tree produces of lightweight, spongy wood that has a straight grain. The strong, durable wood is used for bridges, boxes, lumber, shingles, siding, fencing, and decking. Natural tannin dyes in the wood tend to cause brown stains in paint films. Redwood is resistant to decay and insect attack. It significantly expands and contracts with changes in humidity. Peak lumbering years were 1910-1930.

Redwood (Sequoia sempervirens)

Synonyms and Related Terms

Sequoia sempervirens; sequoia pine; California redwood; humbolt redwood; rødtræ (Dan.); Küstenmammutbaum (Deut.); secuoya (Esp.); séquoia à feuilles d'if (Fr.); séquoia toujours vert (Fr.); sequoia (It.); kustmammoetboom (Ned.); sequóia (Port.); Amerikansk sekvoja (Sven.)

Other Properties

Tree height reaching to 112 m with truck diameter of 7m. Bark = thick, deeply furrowed, and resistant to fire and fungus. Leaves= needles (15-25 mm). Cones=ovoid (15-32 mm long) with spirally arranged scales.

Specific gravity = 0.37-0.38.

Density 28-50 ppcf

Paper fiber type: softwood. Using transmitted light microscopy, fibers are identified by the presence of large, uniform-sized taxodiod pits 3+ across. Fibers are wide. Appearance with Graff "C" stain: varies with pulping and bleaching. Average dimensions of fibers: length 7.0mm, width 60-65μm. Common pulping method: kraft and sulfite.

Additional Images

Authority

  • F. H. Titmuss, Commercial Timbers of the World, The Technical Press Ltd., London, 1965
  • External source or communication Comment: California Redwood Association, San Francisco, CA: air-dry weight = 30 pcf
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 657
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Edward Reich, Carlton J. Siegler, Consumer Goods: How to Know and Use Them, American Book Company, New York City, 1937
  • Marja-Sisko Ilvessalo-Pfäffli. Fiber Atlas: Identification of Papermaking Fibers (Springer Series in Wood Science). Springer, 1995.
  • Walter Rantanen. "Fiber ID Course." Integrated Paper Services. June 2013. Lecture.

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